Needle-latch-riveting machine



Mar. 6, 1923;

J. A. CALDER.

NEEDLE LATCH RIVETING MACHINE.

3 SHEETS-SHEET 1- FILED DEC. 9.1918.

Mar. 6, 1923; 1,447,755.

- J. A. CALDER.

NEEDLE LATCH RIVETING MACHINE. man 050. 9. 191B.

3 SHEETSSHEET 2- Mar. 6, 1923. 1,447,755 J. A. CALDER.

NEEDLE LATCH RIVETING MACHINE.

HLED DEC; 9, 1918- 3 SHEETS-SHEET 3.

Patented Mar. 6, 1923..

iJOHNJAuCBLLDER, OFTOBRINGTON, CONNECTICUT, ASSIGNORTO THE TORRINGTON COMPA'NiY,10F"TO-BRINGTON, CONNECTICUT, A CORPORATION OF CONNECTICUT.

NEEDLE-LATCH-RIVETING MACHINE.

Application filed December 9, .1818. Serial No. 265,878.

T all whom it may concern 7 'Be it known that I, JOHN A. "CALDER, a citizen of the United States, residing at Torrington, inthe county of Litchfield, State of Conneeticut, ha-ve invented certain new and useful Improvements in Needle-Latch-Riw .eting Machines-of which the following is a description, reference being had to the ac- ,compa-nying drawing and to the figures of reference marked thereon.

The invention relates to new and useful improvements in needle latch rivetinginachines, and more particularly to the mechanism for operating the riveting members and the shaping of the riveting members, so as'to form a ball head-at each end of the rivet.

An object of the invention is to provide ariveting .maehine of the above character, wherein the rivet is formed with a ball at each end thereof and the outer edge of each ball head is seated in a recess in the side cheek of the needle and well belowtheouter surfaceiof the needle, so as to prevent sharp corners on the rivet head from fraying'the yarn.

A further object of the invention is to provide ariveting machine whereinthe rivet is headed by a series of light substantially uniform blows, soas to form an enlargement in therivet for a bearing for the latch and for holding the cheeks of the needle separated, while the heads of the rivet are being finished.

These and otherobjects will in part be obvious and will in. part be hereinafter more fully disclosed.

In the drawings, which show by way of illustration one embodiment of the invention,-

Figure 1 .isia side view of a riveting mechanism embodying my improvements;

Figure :2. is a front view of the same;

Figure 3 is -a sectional View on the line 33"0f Figure l;

Figure 4c is a view partly .in front elevationand partly in section, showing the riv eting members and a needle latch in place for the rivet tobe engaged by the riveting member;

-Figure 5 is anenlarged view, showing in full. lines a-section through the needle, with the rivet finished and in dotted lines the riveting members;

Figure 6 is a perspective view of a latch needle having the latch riveted thereto on my improved machine Figure 7 is an enlarged detail longitudinally through the needle, showing the shaping of the rivet and the seating of the ball heads of the rivet in the recess in the side checks of the needle; and

Figure 8 is. a view showing more or less diagrammatically the effect of shifting the operating cam for varying the working position of the riveting members.

My improved needle latch riveting machine includes broadly co-operating riveting members, each of which is provided with a recess for forming a ball head on the rivet.

erating means for the riveting members,

which is so constructed that the workingposition of the riveting members may be varie'd as the heading of the rivet proceeds, whereby a series of light and substantially uniform blows may be given to the rivet for the heading of the same. This enables the center part of the rivet to be enlarged to form journal bearing for the latch and also to support the cheeks of the needle while finishing the heads of the rivet.

The working position of the riveting memhers is varied by shifting the operating cam for the riveting members.

Referring more in detail to the drawings, I have shown my invention as embodied in ariveting machine consisting of a supporting bracket 1, which is mounted upon a suitable frame; and pivoted to the supporting bracket are two levers 2 and 3. The lever 3 is journaled on a bearing 4, while the lever 2 is journaled on a. bearing 5.

At the lower end of the lever 3 is one of the riveting members, which is indicated at 6 in the drawings. At the lower end of the lever 2 is the other riveting member which is indicated at 7 in the drawings.

The riveting members are similar in construction and are backed up by adgusting screws 8, and after riveting members 6 and 7 are adjusted they are held in place by screws 9.

At the upper end of the lever 3 is a roller 10, while at the upper end of the lever 2 is a roller 11. The two levers are drawn towardeach other by means of a spring 12, which is connected to each lever. Intermediate the rollers 10 and 11 is an operating cam 13, which as herein shown is formed with eight flat sides. In other words, the cam is octagonal in cross section. This forms eight corners 14c and eight flat sides 15.

The cam 13 is mounted on a shaft 16, which is journaled in a bearing 17, carried by a sliding head 18. This sliding head 18 has a dovetailed connection with the bracket 1, so that the head may slide vertically on said bracket. On the outer end of the shaft 16 is a belt wheel 19, which is operated by a suitable belt 20, controlled by an idler 21, spring-pressed against the belt by a spring 22. The head 18 is raised and lowered by a lever 23, pivot-ed at 24 to a bracket 25' carried by the frame of'the machine. This lever 23 is suitably connected to the sliding head 18, so that as the lever is vibrated, the head will be raised and lowered. At the rear end of the lever 23 there is a roller 25, which bears on a cam 26 carried by a shaft 2?. A spring 28 operates to hold the roller in engagement with the cam and to swing the lever to raise the head 18. The controlling cam will lower the sliding head against the action of the-spring 28. This cam 26 is so shaped as to gradually shift the head 18 in one direction, and to permit it to quickly return the head to normal position.

It will readily be seen that as the cam 13 rotates the rollers 10 and 11 will pass successively over the high corners of the cam and will be moved toward and from each other. This action on the rollers reciprocates the lower ends of the levers 2 and 3 and causes the riveting action of the riveting members. It will be noted that the riveting members are moved toward each other, positively by the movement of the cam and are separated by the action of the spring. Therefore, the riveting members will be moved toward each other a fixed or definite distance, depending upon the shape of the cam.

When the cam is in the position shown in full lines in Figures 2 and 8, the operating cam engages the rollers 10 and 11 at a point in a line passing centrally through the axis of the shaft 16. The cam 26 operates to permlt the spring 28 to gradually lift the sliding head 18, and this raises the cam 13. As the cam moves upwardly to the dotted line position in Figure 8, the point of contact be tween the cam and the rollers 10 and 11 will be shifted from a line passing centrally through the rollers, and this shifting of the point of contact between the rollers and the cam, varies the workingposition of the levers 2 and 3. l

In other words, the cam is at the position shown in dotted lines at the beginning of the riveting operation and moves downward as the rivet shortens through the light blows iven thereto, the working position of the evers gradually moving inwardly. This continues until the heading of the rivet is finished. As a result, a series of light but substantially uniform blows are given to the rivet throughout. the entire riveting operation. 7

In Figure 7 of the drawings I have shown a needle at N in which a latch L is riveted. The rivet is indicated at 1'. In each cheek of the needle there is a recess a. The finished rivet has an enlarged central portion 1*, which serves as a journal bearing for the latch L. The rivet has a ball head 7' at each end thereof. It will be noted that the extreme outer edge of the ball head is seated in the recess a and well below the outer surface of the needle. This forms a housing for the sharp edge of the head of the rivet. If it should work loose slightly, when the needle is put into use, still the sharp edge will be well below the outer surface of the needle, and, therefore, said sharp edge will not in any way engage the yarn to fray the same.

In order to form thisball head on the rivet, I have provided each' riveting member with a rounded recess 28. This recess should'be as shallow as possible, but yet have sufficient room to make the head of the rivet into ball shape and is of such depth relative" to the recess in the cheek of the needle that the ball head will not protrude beyond the thickness of the needle. The riveting members are also tapered, as indicated at 29, and the extreme active end of the riveting member is of such diameter as to pass into the re ccss n in the check of the needle, so that the edge of the ball head will be seated well down in the recess and below the outer surface of the needle.

The needles with the latches inserted and the rivet material in place, are inserted between the riveting members 6 and 7 by any suitable means and held in proper position for the riveting members to engage the rivet until the riveting action is completed. The first tapping or riveting action of the ends of the rivet will cause the enlargement r to form in the rivet at the central portion thereof and this forms a journal bearing for the latch and also a support for the checks of the needle to hold the same firmly during the further heading operation of the rivet.

As the riveting action proceeds, the working position of the levers carrying the riveting members will gradually move inwardly toward each other, following up the shortening of the rivet through the riveting action thereon. I am thereby able to strike the rivet a series of very light blows, which are substantially uniform. The final action of the riveting members is the balling of the rivet heads and the seating of the same in the recesses in the cheeks of the needle.

While I have described a special form of riveting member which forms a ball head at each end of the rivet, it will be understood that other forms of riveting devices may be used in connection with my riveting mechanism, which is so constructedas to give a series of light but substantially uniform blows to the rivet during the heading of the rivet.

It will also be obvious that minor changes in the details of construction and the arrangement of the parts may be made, without departing from the spirit of the invention as set forth in the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is i 1. In a needle latch riveting machine, the combination of co-operating rivet heading members, and means for giving said members a movement toward and from each other for heading the ends of the rivet, said means including devices for varying the working position of said members, whereby a series of light substantially uniform blows may be given to the rivet.

2. In aneedle latch riveting machine, the combination of co-operating rivetheading members, means for giving one of said members a. movement toward and from the other for heading the rivet, said means including devices for varying the working position of said member, whereby a series of light substantially uniform blows may be given to the rivet.

In a latch needle riveting machine, the combination of a rivet heading member, a support therefor, an actuating member engaging the support for reciprocating the rivet heading member, and means for shifting said actuating member whereby a series of light uniform blows are given to the rivet.

4. In a needle latch riveting machine, the combination of co-operating rivet-heading members, a pivoted lever for each member, a cam for positively moving the levers for causing the members to head the rivet, and means for shifting the cam, whereby a series of light substantially uniform blows may be given to the rivet.

5. In a needle latch riveting machine, the combination of co-operating rivet heading members, a pivoted lever for each member, means for yieldingly moving the outer ends of said levers toward each other, a roll carried by each lever, a rotating cam between said rolls, said cam having uniformly disposed flat surfaces whereby as the cam rotates, the levers will be vibrated. and means for shifting the cam to vary the working position of the levers, whereby a series of light substantially uniform blows may be given to the rivet.

6. In a needle latch riveting machine, the combination of pivoted levers, a rivet heading member adjust-ably carried by each lever, means for yieldingly forcing the outer ends of the levers toward each other, a roll carried at the outer end of each lever, a cam having uniformly disposed flat sur faces co-opera-ting with each roll, and means for shifting the cam in a direction toward and from the fulcrum points of the levers for varying the working position of the levers.

7. In a needle latch riveting machine, the combination of pivoted levers, a rivet heading member adjustably carried by each lever, means for yieldingly forcing the outer ends of the levers toward each other, a roll carried at. the outer end of each lever, a cam having uniformly disposed flat surfaces cooperating with each roll, and means for shifting the cam in adirect-ion toward and from the fulcrum points of the levers for varying the working position of the levers, each rivet heading member having a rounded recess for forming a ball head on the rivet.

8. In a needle latch riveting machine, the combination of pivoted levers, a rivet head ing member adjustably carried by each lever, means for yieldingly forcing the outer ends of the levers toward each other, a roll carried at the outer end of each lever, a cam having uniformly disposed flat surfaces cooperating with each roll, and means for shifting the cam in a direction toward and from the fulcrum points of the levers for varying the working position of the levers, each rivet heading member having a. rounded recess for forming a ball head on the rivet, and each rivet heading member being so shaped as to enter a recess in the check of the needle for seating the extreme outer edge of the ball head well below the outer surface of the needle.

In testimony whereof, I afiix my signature, in the presence of two witnesses.

' JOHN A. CALDER.

Vitnesses D. HrLn-nnrrrr, M. A. OMEARA. 

